Good Tuesday morning. Politics Nation is off to Iowa this morning to spend a few days on the trail. Check back often for updates, but pardon if we're a little slow today. Should be back on track by mid-morning. In the meantime, here's what Washington is watching this election day:

-- The House today will vote to override President Bush's veto of the Water Resources Development Act, while moving on a conference report on a Labor, HHS and Education Appropriations funding bill that also faces a presidential veto threat. WRDA, as it's called, is likely to become the first presidential veto overridden during President Bush's term, while Labor/HHS/Education's fate is less clear.

-- The Senate Judiciary Committee, meanwhile, will vote on Michael Mukasey's nomination as Attorney General. Thanks to support from Democrats Chuck Schumer and Dianne Feinstein, his nomination is likely to move to the Senate floor with a favorable recommendation. This is the second time in recent months that Feinstein has bucked her party on a nomination vote -- she also cast a crucial vote in favor of Judge Leslie Southwick in August. Paul Kane has already compared her to Joe Lieberman, and suggests the one-time mayor of liberal San Francisco might have serious problems with her lefty base.

-- It's Election Day in Mississippi, Kentucky, Virginia, New Jersey and Ohio's 5th Congressional District. Check out the list of races we're watching this evening (and check back with Politics Nation for live results) as well as today's weather forecast everywhere ballots are being cast. Here's a scary scenario for the GOP: Top Republicans rallied this weekend in Virginia Beach, not in Northern Virginia, where key races will likely decide control of the State Senate. Are they just hoping to not fall too far behind?

-- Two big establishment endorsements in recent days for Mitt Romney and Hillary Clinton. The nods, though, mean two very different things for the candidates. Romney yesterday won the backing of influential conservative power broker Paul Weyrich, giving Romney further, and somewhat surprising, inroads with social conservatives. Clinton has been endorsed by Walter Mondale, which might do more to push Barack Obama's contention that Clinton is a continuation of the last 20 years of Democratic narrative. By the way, look for an excellent examination of the Clinton/Obama feud in the forthcoming Atlantic, courtesy one Mr. Marc Ambinder (though it's not online yet). Clinton and Romney, meanwhile, are favored to win their primaries by one smart politico, Dick Gephardt, who made his comments at a power lunch yesterday. Also offering thoughts: Dick Armey and Charlie Cook.

-- Seeking any union support they can find, apparently, Clinton, Obama and John Edwards are all supporting the Writer's Guild of America as they strike across Hollywood. Perhaps the three are happy they don't have to face Jon Stewart or Stephen Colbert, both of whom are not producing new shows until writers come back. Then again, is a writers' strike something akin to a baseball players' strike? We'll find out in about a month when every sitcom is forced into reruns.

-- In slightly more serious news, we've argued that Edwards needs to make a case against Obama as much as he does against Clinton -- and he probably needs to make the Obama case first, in order to reassert himself as the evident Anybody-But-Clinton candidate. A preview of the case Edwards might make: "Obama's been out there for 10 months, and he hasn't really taken hold," Edwards might say. "In a lot of ways, he's had his shot to make his case, and we're just beginning to make ours." That could be what Edwards would say. It was exactly what Edwards strategist Joe Trippi told the Iowa Independent (thanks, Halperin).

-- Wise Man Of The Day: Rhode Island Gov. Don Carcieri is probably the only sane person in the entire primary calendar struggle. Carcieri vetoed legislation yesterday that would have moved his state's primary to February 5th, and while Democrats hold huge majorities in the House and Senate, they don't meet again until January, meaning the state would not have time to get ready for an early contest. Meanwhile, Michigan Democrats vote tomorrow on their January 15th primary, paving the way for Bill Gardner to set the New Hampshire date on Orthodox Christmas. And at TNR, I take an in-depth look at the primary chaos, and why no one at all can stop it.

-- Today On The Trail: Mitt Romney is in Greenville, then meets voters in Anderson, South Carolina. John McCain is in Ames this morning, just about three months after he skipped the GOP straw poll there, followed by stops in Boone, Decorah and Cedar Rapids. Fred Thompson meets voters in Columbia, Fort Mill and Spartanburg, South Carolina.

-- Hillary Clinton is in Newton, Iowa, for a tour of a biodiesel plant, then rallies with voters in Amana. Elizabeth Edwards is named a Woman of the Year by Glamour Magazine in New York, while her husband holds events in Newmarket, Portsmouth and Durham, New Hampshire. Joe Biden tours a Riverdale, Iowa business, while Barack Obama holds a late town hall meeting in Cedar Rapids. Bill Richardson releases a book tomorrow on leadership and spends the day in New York raising money.