I don’t really understand this story by the AP.

Check it out…

WASHINGTON (AP) – Barack Obama has effectively clinched the Democratic presidential nomination, based on an Associated Press tally of convention delegates.

The tally put Obama over the top Tuesday, ahead of the results from the day’s final primaries in Montana and South Dakota. The Illinois senator becomes the first black candidate ever to lead his party into a fall campaign for the White House. Obama outlasted former first lady Hillary Rodham Clinton in a historic contest and now faces Republican Sen. John McCain of Arizona for the presidency.

Based on what? I haven’t seen the superdelegate tsunami some were reporting earlier, and all the sources I can find have him more than 30 delegates from clinching.

What gives?

Between wrongly reporting that Hillary will concede tonight, to now claiming Obama has clinched, it hasn’t been the best day for the AP’s credibility.

Politics Obama Clinches?