Congressional leaders are straining to get their absentee members to return to Capitol Hill as the House's vote margins on major legislation grow ever more precarious. Why it matters: Just on Thursday, an Iran war powers resolution failed to pass in a tie vote. Any lawmaker could have tipped the outcome — and half a dozen were absent. "People cannot miss votes," a senior House Democrat told Axios. The truants on that vote included Reps. Tom Kean Jr. (R-N.J.) and Frederica Wilson (D-Fla.). Both have missed weeks of votes. The mystery of Wilson's absence was solved on Thursday — she is recovering from a major eye surgery — but questions surround Kean's mysterious disappearance. What we're hearing: House Minority Leader Hakeem Jeffries (D-N.Y.) urged Wilson in a recent phone call to return to Washington, D.C., as quickly as possible, according to the senior House Democrat and another source familiar with the matter. "You've got to come.…