Guess he's going to need that Senate web domain after all. After privately conceding that Chris Christie's surge in popularity made a run for governor impossible, Newark Mayor Cory Booker very publicly announced Thursday morning that he is exploring a run for a New Jersey Senate seat in 2014, if — and it's a big "if" — Sen. Frank Lautenberg retires. Speculation had been brewing for weeks, and a report surfaced earlier in the morning that Booker would tweet his intentions, and then came the tweet to the popular (if controversial) mayor's 1.3 million followers late in the morning. Here it is:

The tweet, of course, pointed to a YouTube video on CoryBooker.com:

The video spends a lot of time defending his record as mayor, but it's clear that Booker has long sought the national spotlight — as if it wasn't clear he was in it already. It's also clear, as Politico's Byron Tau points out, that the Koran is prominently on Booker's desk in the video:

What's not exactly clear just yet is whether Lautenberg will, in fact, retire before Booker seeks to replace him:

One of Booker's tweets earlier today struck a philosophical note (perhaps due to recent negative coverage of — you guessed it — his prolific tweeting ):