Politico Playbook reports: Former President Barack Obama is set to reprise his nearly decadelong, post-presidential career as the Democratic Party’s closer-in-chief — not just on the campaign trail, but on the airwaves, too. Last week, Obama cut ads for 24 Senate and gubernatorial campaigns, his office confirmed first to Playbook. Expect them on your screens soon. Obama’s strategy in the sprint to Election Day “is driven by where he can move the…