Arizona Democratic Rep. Ruben Gallego plans to launch a challenge on Monday against Sen. Kyrsten Sinema. Kirsten misrepresented herself when running for office. Sinema switched from Democrat to independent in December, but she would be a better fit with the Republican party. Via CBS News: Gallego, an outspoken liberal Democrat, has long been critical of Sinema, who dropped her party identification as a Democrat to be an independent just after the party won the Senate last year.