Barrack Obama
President Obama repealed the "Don't Ask, Don't Tell" presidential order that prevented gays from serving openly in the military. Additionally, he has instructed United States attorneys to not fight gay equal rights activist's attempts to have the Defense of Marriage Act ruled unconstitutional. The Defense of Marriage Act currently prevents the federal government from recognizing same-sex marriages that are now legal in several states.
On May 9th 2012 President Obama publicly announced his support for gay marriage.
That's a difficult question to answer. Since it was so unacceptable an idea it was not discussed and probably not even imagined by the general public until 15-20 years ago it's reasonable to assume all presidents have been opposed to gay marriage including Barack Obama, until recently.
In the United States, Barack Obama in May 2012. Many other presidents also support it, including the current French president.
Yes, the Socialist Party of France does support same-sex marriage. As of September 2011, France now has a Socialist President of Parliament for the first time in its history.
The president does not have the power to either allow or forbid gay marriage. However, Obama is the first President to say that he is in favor of allowing it.
Niinisto is Finland's first conservative president in fifty years. He won by beating an openly gay candidate. Niinisto believes in gay rights, but says that the word "marriage" should be reserved for use by heterosexuals only.
The First Lady supports the legalization of same-sex marriage.
Apparently, they do not, since all of the NZ First MPs oppose the marriage equality bill.
during the president's first year in office
Franklin D. Roosevelt
The first president chose the federal officials on his their qualifications and from his support.
He was the 6th President of the United States of America but the first President to support prostitution.
Lyndon Johnson in 1966 was the first US President to visit Australia. He was seeking support for the Vietnam War.
Obama :)
The process is very similar to divorcing after a first marriage, although separating the finances and determining spousal and child support gets more complicated.