Democrat Tom Daschle and Republican Trent Lott, both former majority leaders of the US Senate, have come together to write a book sounding an alarm about the partisan gridlock that has paralyzed Washington in recent years (including during their tenures as leaders). Tonight, the two authors of “Crisis Point: Overcoming Our Broken Politics” are joined by Atlantic magazine staff writer Molly Ball to discuss their ideas at the start of what could be the most politically polarized year yet. 92nd Street Y, 1395 Lexington Ave. at 92nd St., Buttenwieser Hall. Jan 20, 7:30 p.m. Tickets are $35 at 92y.org.