She began her political life with Ralph Nader's Green Party, but the Kyrsten Sinema who is running for Arizona's open Senate seat is now among the most conservative Democrats in the U.S. House. It's a transformation that took place gradually, at first, but appears to have accelerated over the past two years.

[SPECIAL SECTIONS: Election 2018 | Arizona politics]

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Sinema spoke out as an anti-war protester in 2003. In 2005 and later years, she spoke out for immigrant rights, including butting heads with then Gov. Jan Brewer. But during her time in the state Legislature, she began reaching across the aisle.

Since her third term in the U.S. House began, Sinema has become more conservative. The website, FiveThirtyEight, which tracks votes, states that Sinema has voted with President Donald Trump's position 60.9 percent of the time.

[RELATED: In Arizona’s Senate race, Democrat seeks to flip a GOP seat]

Those votes include rolling back bank regulations, voting against a carbon tax, for an immigration bill that included money for a border wall and for a bill that blocked Iraqi and Syrian refugees from coming to the United States.

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"I have evolved and changed, and I am really proud of that," said Sinema last week during an interview with Arizona's Family anchor Heather Moore.

[RELATED: Meet the candidates for US Senate: Kyrsten Sinema]

When asked what would be the highest compliment anyone could pay to her, Sinema responded by saying, "If the voters of Arizona said Kyrsten Sinema works hard for us and she doesn't march to anyone else's drum."

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