WASHINGTON (CNN) -- First lady Laura Bush heads to the Sunshine State Friday to campaign in two battleground congressional districts closely watched by both sides this election season.

Bush is slated to speak at a fundraiser for GOP Congressional candidate Vern Buchanan in Sarasota, a wealthy car dealership owner vying for outgoing GOP Rep. Katherine Harris' seat. Christine Jennings is the Democrat in this increasingly competitive contest.

The first lady then heads to a reception in Florida's 22nd district where incumbent GOP Rep. Clay Shaw is in the political fight of his life against a well funded Democrat, Ron Klein.

Bush has assumed a visible role on the 2006 campaign trail, crisscrossing the country on behalf of GOP candidates. On Saturday the first lady is slated to make stops in three northeastern states.

Related: CNN's Ed Henry reports on Laura Bush's first comments on Woodward book

For more of CNN's coverage of key races, check out America Votes 2006