Good Thursday morning, and happy Valentine's Day. Aside from where to find roses that aren't wilted or a hundred dollars a dozen, here's what Washington is watching today:

-- The Senate today begins debate once again on a bill regarding Native American health care.Treasury Secretary Hank Paulson, SEC commissioner Christopher Cox and Fed chair Ben Bernanke head to the Hill to testify before the Senate Banking Committee. Meanwhile, the House Appropriations Committee takes up the budget for the entire lower chamber, where they will hear from the Sergeant at Arms, whose last name happens to be Livingood. Most legislative business will be taken care of this morning in the House, sending lawmakers home early yet again.

-- Hillary Clinton may have something to say about this, but John McCain and Barack Obama are increasingly turning their guns on each other. McCain has been mentioning the fact that Obama was rated the "most liberal" Senator by National Journal, while Obama is attacking McCain for not knowing much about the economy, as the Politico guys write. "John McCain is a great American hero, a war hero we honor his service. But economics is not his strong suit," Obama said in Richmond on Saturday. Watch Obama, the younger, less experienced candidate, turn that potential weakness on its head and argue that he's better on the economy than McCain, a one-time chair of the Senate Commerce Committee.

-- A chief argument Clinton has turned to lately is that she has been tested, while Obama has not been, and that he's never faced a negative attack. In fact, she's largely right, but as AdAge's Ken Wheaton points out, that's due to her failure to actually run a negative attack against him. Her new ad in Wisconsin can hardly be considered negative, but it does accuse Obama of skipping debates, after putting the candidates' images side by side. It's a simple ad, and it's the first time Clinton has gone after an opponent in the primaries.

-- Clinton will -- and should -- still dispute the notion that the race is all but over, and that Obama and McCain will face each other in the Fall. For starters, she's actually paying attention to Wisconsin, where she has lured Iowa manager Teresa Vilmain out of semi-retirement to run the state's operation, Newsday reports. Clinton will be in the state beginning Saturday, and she may not leave until Tuesday's primary. It's also where she's running that certain ad we mentioned above.

-- Another line of attack McCain will offer against Obama: That "hope" itself doesn't mean much, per a luncheon campaign manager Rick Davis held with reporters yesterday, per Hotline's Maura O'Brien. But they're not done with the primary, thanks to Mike Huckabee's persistence. Davis said he hopes to have the nomination wrapped up by March 4, which, while still plenty early, gives political writers another two weeks of stories based on McCain's inability to shut Huckabee down.

-- Davis is about to lose a top consultant, as Mark McKinnon's days with the McCain campaign are numbered, it appears. McKinnon, a former Democrat who left Texas to work for President Bush, is one of John McCain's top ad men, but he says he would feel uncomfortable writing the scripts that would be used to go after Barack Obama. So, if Obama is the Democratic nominee, McKinnon will sit this year out, according to the Swamp and others. McKinnon told National Public Radio that he will back McCain "one hundred percent," but that he will do so from the sidelines.

-- Still, Huckabee's inspiring little confidence in his own campaign when he doesn't bother to stay in the country to try and win votes. Huckabee will leave Wisconsin tomorrow to fly to the Cayman Islands to give a speech to the Young Caymanian Leadership Awards, CNN reports, and won't be back on the trail until Sunday. Huckabee will be paid for the speech, a practice the Politico noted in December, but if anything, it's probably hurting him electorally more than it's helping him financially. Meanwhile, it's a decision Politics Nation would probably make too, but for another factor: At 8 a.m., weather on Grand Cayman was partly cloudy and 77 degrees. At 7 a.m. local time in Milwaukee, it was just 25 degrees and overcast.

-- Spin Of The Day: Huckabee is still in the race, doing his best to deny McKinnon a job in any event. Regardless of trips to the Caymans, the man knows how to spin. A statement yesterday, on his losses on Tuesday: "We lost the battle of the beltway last night, but the beltway is not my turf -- the heartland is."

-- Today On The Trail: Clinton heads to Warren, Ohio to tour a factory and talk about the economy. She will later hold a round table in Dayton and rally in Columbus. McCain has media availabilities planned for Burlington, Vermont and Warwick, Rhode Island, where he will also hold a rally later today. Huckabee, meanwhile, rallies in Madison, La Crosse, Rothschild and Green Bay, Wisconsin. Obama, it looks like, is taking the day off.