Experts say it’s harder today than it was a decade ago for prosecutors to build a political corruption case against lawmakers like Sen. Bob Menendez, D-N.J., who is on trial for allegedly accepting bribes in exchange for political favors.That’s because of a landmark 2016 Supreme Court decision that narrowed the definition of political corruption, including what is considered official acts.READ MORE: Sen. Menendez reveals his wife has breast cancer as presentation of evidence begins at his trialMenendez and his wife, Nadine, were indicted last September on corruption charges and pleaded not guilty. Prosecutors added a charge of obstruction of justice and another charge accusing the pair of conspiring to act on behalf of Egypt while Menendez was serving as chair of the Senate Foreign Relations Committee.An FBI raid at Menendez’s home in 2022 turned up 13 gold bars and almost $500,000 in cash, stuffed into jackets hanging in the closet, inside bags and a safe. His defense team has argued...