CAN SINEMA DELIVER SANDERS? We’re still skeptical. But senior Democrats were telling us Sunday night they think the White House is actually considering the trillion-dollar bipartisan infrastructure deal floated by 10 centrist senators Friday. First, however, they need to see if their own members can swallow it. Democrats are going to have some candid family conversations this week. If they’re going to get behind an infrastructure proposal that’s half the size of what they were shooting for, they need assurances from two colleagues in particular — Sens. KYRSTEN SINEMA (Ariz.) and JOE MANCHIN (W.Va.) — that they will be there to back a lot more later through reconciliation. Some Democratic leaders are concerned that if they endorse a bipartisan deal like the pair of centrists want, the duo will play hard to get when it comes time to go Democrats-only. A reconciliation package would likely include sweeping climate provisions, a massive investment in family and child care and higher corporate taxes. “There would have to be clarity that we’re getting the second package. Manchin and Sinema are going to have to give assurances to BERNIE [SANDERS],” said one senior Democratic source.