WASHINGTON — New Jersey Sen. Cory Booker admitted he’s concerned about scandal-scarred Maine Senate hopeful Graham Platner after it emerged that he sexted several women. “Yeah, I have concerns. The guy has questions to answer, and that’s what campaigns are for,” Booker (D-NJ) told ABC News’ “This Week” on Sunday when asked if the controversy could imperil Dem hopes of flipping Maine’s seat. Booker declined to discuss the specific controversies dogging Platner ahead of the June 9 primary. Instead, he underscored the stakes of the battle for control of the Senate. ABC: Do you have concerns that Graham Platner may jeopardise...