Simply put, I don't blame Hillary Clinton for the war in Iraq. At the time Hillary and other Democrats gave President Bush authority to invade Iraq in October of 2002, Saddam Hussein was not cooperating with United Nations led efforts to inspect his country for weapons of mass destruction (WMDs).
When the vote was cast, many thought giving Bush the authorization to use force would bring Hussein to the negotiating table, and it worked. About a month after the vote was cast, Hussein caved into the global community and let in the inspectors. Those who voted for the war authorization were vindicated: the problem was solved without having to use force. When Hussein let in the inspectors, many thought war was off the table.
What happened next shocked the world. After Hussein cooperated with inspectors and let them in his country in December of 2002, the Bush administration began planning to attack Iraq anyway. While inspectors were on the ground and not finished with their inspection in March of 2003, Bush told them to leave. In the face of global opposition, Bush declared war on a country that had already caved into international pressure.
At the time, Bush said Iraq had WMDs and was not cooperating with the weapons inspections, but weapons inspectors were not complaining about Hussein's lack of cooperation and did ask the Bust Administration if they had any intelligence that would point them to the alleged hidden WMDs. Bush's response was simply telling the inspectors they had to leave so he could start his war.
When the Senate voted to give Bush war authorization, they had no idea that Bush would declare war on a country that was complying with the United Nations, that he would declare war in the face of opposition from close allies, like France and Germany, that he would declare war ignoring the millions who marched in the streets from London, to Paris, to Rome, to New York City.
How many in the Senate would have voted for the same war authorization in February and March with UN weapons inspectors on the ground? Not many.
The decision to invade a country that was already cooperating with UN weapons inspectors, was Bush's and Bush's alone.