(MCT) — BOCA RATON, Fla. — Foreign policy may be the topic, but undecided voters will be the targets when Mitt Romney and President Obama hold their third and final debate Monday night.

Mobilizing supporters is a priority for both men. It is especially vital for Obama, whose backers are less likely to vote than Romney’s, polls indicate. But with the latest opinion surveys showing the race dead even, it is increasingly likely that the next president will be chosen by a relatively tiny group: swing-state voters who have yet to commit firmly to either candidate.