Senate Majority Leader Bill Frist and other Republican leaders are pushing for a constitutional amendment that would ban same-sex marriage. The amendment defines marriage as solely between a man and a woman. The amendment is expected to die in a procedural Senate vote today. George Bush’s support from the Christian right is based largely on the issue of gay marriage and Bush has spoken out against so-called activist judges that those in Massachusetts who legalized same-sex unions. An amendment in the Senate version of the Constitutional change was designed to win the support of more moderate conservatives, but it is unlikely the amendment will win the 60 votes necessary to cut off debate and move to a vote on the amendment itself.