WASHINGTON - US President Barack Obama said on Wednesday he believed same-sex couples should be allowed to get married, marking a shift in his evolving position on the issue that is likely to please his political base and upset conservatives.

"It is important for me to go ahead and affirm that I think same sex couples should be able to get married," Obama said in an interview with ABC's Robin Roberts.

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Obama's comments came days after Vice President Joe Biden said he was comfortable with gay marriage.

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