* From the Tribune…

Titled “Tough,” the 30-second spot will begin airing Monday as part of a large, nearly $750,000 ad buy of broadcast Chicago TV stations.

Showing images of Emanuel talking and greeting people around the city as part of his five-week ramp-up to the mayoral run he formally announced Saturday, Emanuel narrates, saying Chicago is “at a crossroads” and needs a mayor to make difficult but necessary decisions.

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* Roundup…

* Axelrod on whether Obama will campaign for Rahm Emanuel for mayor: “Well, the president has made clear what his view of Rahm is. He said he was an excellent chief-of-staff, thought he would be an excellent mayor. Whether he involves himself actively in this campaign is a matter that we haven’t yet decided. But I think his view of Rahm is very clear.”

* For Emanuel, path to Chicago mayor is not without obstacles

* Giannoulias staying out of mayor’s race

* Alexi Giannoulias Will Not Run for Mayor

* Ed Smith 8th alderman not to run: sources

* Mayoral Candidates Set To File Petitions

* Davis, Meeks step into mayoral ring

* Field to replace Daley gets more crowded

* Former GOP chair helps Meeks kick off campaign

* Davis throws hat in ring for mayor

* Danny Davis Launches Mayoral Campaign

* Davis says he’s best to bridge gap between rich, poor

* State Sen. Meeks to announce mayoral run

* James Meeks’ bio

* Q&A with Gery Chico: His bid to be Chicago’s mayor

* Sneed: Very Gery: The Chico file

* Washington: Consensus coalition fails mission

* Marin: Let’s get to know the other mayoral candidates

* Emanuel: It’s on

* Rahm Emanuel officially in race to be Chicago’s mayor

* Emanuel formally announces run for Chicago mayor

* Rahm Emanuel’s biography