The Republican Party's Weekly Address will be delivered tomorrow morning by Alabama Rep. Parker Griffith, who surprised the political world in December by switching to the GOP after being elected to Congress in 2008 as a Democrat. Griffith practiced medicine for 17 years before starting his own business and later entering politics.

So as Democrats push a health care reform package through Congress, Republicans are putting out front a doctor who switched parties partially because of the issue.

"The fact that a doctor who left the Democratic caucus is delivering the address this week is no coincidence," said a senior GOP aide. "This is a shot across the bow of any 'moderate' Democrat in the House who is considering voting for a health care bill loaded with tax hikes, Medicare cuts, and notorious backroom deals."

Griffith's district also happens to be heavily Republican. John McCain won 61 percent of the vote in 2008. Despite switching parties, Griffith will still have a tough time being re-elected this year, as he faces a competitive GOP primary.

UPDATE: CNN reports that a House Minority Leader John Boehner-headlined fundraiser for Griffith in Huntsville on Monday will be protested by both Tea Party groups as well as Democrats -- what some might say is an unusual and rare pairing.

Also, a Democratic source passes along this attack ad from the National Republican Congressional Committee, which aired during the 2008 campaign. The ad accuses Griffith of "shameful conduct" as a doctor, as well as "warehousing cancer patients, underdosing them so he could make more profits through protracted treatments."