The Sacramento Metropolitan Chamber of Commerce on Thursday endorsed the strong mayor initiative going before primary election voters next summer. Following study by a task force, the business association voiced support for an executive mayor with more power than the current city charter allows. The initiative's passage would change the form of city government that was established in 1921, according to the chamber. "The city of Sacramento deserves a government structure that is effective and accountable," said Matt Mahood, president and chief executive officer of the chamber, in a press conference at chamber headquarters. The press conference was held about a week after several local u