Democrats tackle issues from college tuition to healthcare.
A part of the McCain-Feingold reform law is being contested on behalf of wealthy candidates running for Congress.
Rep. Tom Cole, head of the National Republican Congressional Committee, says voters in districts with open GOP seats will still vote Republican. But he acknowledges challenges for the November election.
The spate of Republican retirements will make it difficult for his party to take control of Congress in 2008, he said at a Monitor breakfast Thursday.