Beacon Hill blue blood John Kerry likes to portray himself as the presidential candidate of the common man. But there's one common man he finds indispensable on the campaign trail: his butler. Like a scene out of the old British drama "Upstairs Downstairs," Kerry would be helpless without his trusty manservant Marvin Nicholson by his side, who stands ready to cater to his master's every whim, according to the New York Times today. "When he wants that peanut butter and jelly sandwich, I'm ready," Nicholson told the Times. Of Nicholson's omnipresence on the campaign trail, the paper noted, "Mr. Kerry...