A campaign issue for who?
Out of 300 million Americans, it would be a campaign issue for about 2,327—max.
And, if you don’t agree with that number, then how many. Not “a lot,” but a specific number.
You don’t think the media would beat this to death until everyone knows about it? Right now most people don’t even know there’s a controversy about who is a natural-born citizen, even the relatively well informed. It will scare off the voters who don’t understand it without the same rule being applied to Obama.