with a group that when gomez hit back, some of his inexperience shows. for him f. it could be as dirty and low as pond scum. reporter: do you think that ed markey is pond scum? gomez indicated to cnn he regrets the comment. was hi thinking it, yeah. should i have said it? probably not. he may be a fresh face, but he s prohotting the stalest old republican ideas. gabriel gomez is a very bad man. now he s mocking the ads. he even leaves the toilet seat up. reporter: but the race is no laughing matter for the president, who made a pit stop at a boston sandwich shop to remind voters what s coming in less than two weeks. i want to make sure everybody turns out and votes. all right? reporter: there s one difference. three years ago scott brown was openly campaigning again president obama.