Americans will be “f**ked” if Barack Obama gets re-elected … this according to Beach Boys singer Bruce Johnston.

Bruce was signing autographs for fans in New York yesterday when the conversation turned political.

“Obama’s an a**hole, “Johnston says … adding, “Unless you’re interested in never having any money and being socialized.”

But Johnston was an equal opportunity disser — saying, “And who’s the Republican a**hole?”

“Our guy isn’t any good.”

He continued, “You got Reagan and Tip O’Neill … those are the last two good guys.”