McCaskill: The Immigration Bill Is "a Mess"

One of the many unknowns of the immigration debate is how the freshmen senators and representatives -- some of whom ran on a tough, borders-first platform -- will vote on whatever bill emerges from debate.

Interest groups are keeping a close eye on at least two undecided Democrats: Sen. Jon Tester of Montana and Sen. Claire McCaskill of Missouri.

In an interview yesterday, McCaskill said the bipartisan compromise would need to change a lot to win her support.

"If I had to vote on the bill now, I would definitely vote 'no'," McCaskill said.