There is a number of antis that would love to pass gun control if given a chance and they felt they could get the vote.
Yes more and most of the serious antis in power are in the Democrat box. Even the pro-gun variety are often for increased licensing, classes, checks, and other increased government oversights that lead to easier implementation and acceptance of future gun control.
But there is some bad republicans too, including many that only pay lip service to appeal to more of the party but would readily support a ban if the tide turned that way.
Mitt Romney is the Republican top runner at this point favored for the presidential ticket, and he is a lip service guy that is rather anti-gun and from anti-gun MA where he certainly hasn't reduced the anti-gun laws in place there and has actually passed more into being:
http://www.ontheissues.org/governor/Mitt_Romney_Gun_Control.htm
He supports a new Assault Weapon ban, supported the Brady Bill, and would sign any anti-gun bill if he felt the tide was going that way. He would be the kind of guy to back bi-partisan "common sense" controls.
It would be great if supporters of both parties could pressure them to support the Constitutional right, removing it as a partisan issue.
The basic rights in the Bill of Rights should not even be an issue we need to vote on, all candidates swear an oath to them on taking office after all.
We need to make it happen.
As for Obama, we can all see his voting record prior to becoming president where he voted for virtually all gun control ever considered.
He has not enacted gun control as president, but he is also aware the largest surge of firearms purchases in US history happened as a result of him taking office.
They know how many NICs checks they ran, and he is well aware it is not as safe to be anti gun at the national level as it was as a Chicago representative. There was some water testing though after Giffords was shot, but the country was still so solidly pro-gun that it was obvious it was not the time.
Then the foreign and domestic pressure to reduce our rights for the alleged benefit of Mexico (even though many of the weapons used trickled down from government) has been resisted by him as well. He even told the anti-gun Attorney General he appointed to stop publicly calling for an Assault Weapon ban.