Political Headlines - August 22, 2013

*    A Clinton-Biden clash in 2016 presidential race? Maybe: National political reporter Matt Viser reports on the potential Democratic contenders for the Oval Office - and how friendships could turn into rivalries.

*    Scott Brown won't run for governor: The former senator said last night he would not run for governor next year, ending months of uncertainty within the Republican Party and effectively sweeping a path to the nomination for 2010 gubernatorial nominee Charles D. Baker. politics editor Jim O'Sullivan details.

*   State's dangerousness law rarely invoked: The law was not invoked last week, when Middlesex prosecutors chose not to seek a dangerousness hearing for Jared Remy.  Remy is charged with stabbing his girlfriend to death the following day. Peter Schworm reports.

*    State senator Dan Wolf to resign seat, suspend gubernatorial campaign: In breaking political news, Wolf, whose stake in Cape Air has drawn scrutiny for its business with the state, told supporters he was resigning his seat and suspending his gubernatorial campaign.

*    Connolly rejects $500,000 pledge from outside group: Boston mayoral candidate John Connolly said he does not want the money pledged to him earlier this week by an Oregon-based education nonprofit. Political reporter Wesley Lowery reports.