News breaks as White House stays mum on filing
Some seek reassurances during confirmation proceedings
Olson's assistance criticized as 'completely counter' to his marriage equality goals
'Poison pill' amendments could emerge during panel markup
Brings total number of bill supporters to 31
Support brings number of Senate co-sponsors to 30
Petition of more than 3,000 names to be delivered Friday
Kohl, Klobuchar voice support for Respect for Marriage Act
