Frist Stabbing Center In Back?

     A blog named ThinkProgress has this quote, supposedly from the National Journal (htaccess password protected).

Senate Majority Leader Frist will file for cloture on President Bush’s nomination of William Myers to the 9th U.S. Circuit Court of Appeals later this week, according to sources on and off Capitol Hill, wasting no time in testing the resolve of 14 Republican and Democratic senators who forced at least a temporary halt to the battle over Democratic filibusters of President Bush’s judicial picks.

     It's not entirely clear. 1. It just says 'sources.' 2. It, by itself, isn't necessarily a renege on the deal.  Part I(B) doesn't say no cloture can be made on Myers.