WASHINGTON, DC -- It is a critical day for gun control.
The Manchin-Toomey compromise is set for a vote in the Senate Wednesday.
Among other things, it would require federal background checks for purchases at gun shows and over the internet. As of Wednesday morning, backers do not have the 60 votes they need.
Four republicans have suggested they will vote for it. However, at least two Democrats from conservative states may vote against it. Supporters say they are not giving up.