I have figured out a way to get the Republicans to understand why they should lead the fight against the current version of the FISA bill.
Emphasize that Obama is likely to win the presidential nomination, and point out that the Democrats could end up with a majority in the House and a strong majority in the Senate.
Then, have Dennis Kucinich or some other progressive get up and start a campaign to have Obama use FISA to investigate Rush Limbaugh, Ann Coulter, Karl Rove, Fox News and other purveyors of hate. Point out that these folks are worthy targets of FISA spying because they seem to be nurturing hate groups that appear to have ties with potentially terroristic neo-Nazi groups in Europe.
Once the wingnuts start thinking that the Democrats will somehow try to use FISA against them, maybe they'll understand why it's a bad thing.