EL PASO, Texas — An El Paso attorney and Democrat has announced she's running against incumbent Republican U.S. Sen. John Cornyn.

But Maxey Scherr says she's most-interested in stopping his Senate colleague and fellow Texan Ted Cruz.

Scherr kicked off her campaign at an El Paso event with about 100 supporters Thursday. Spokesman Daniel Barash said Scherr has filed paperwork to compete in next March's Democratic primary.

Scherr wants to serve as a Senate counterweight to Cruz on issues like immigration and health care. While Cornyn is up for re-election next November, Cruz is in the first year of his 6-year term.

She becomes the latest in several little-known Democrats and Republicans challenging Cornyn.

On Wednesday, wealthy Democratic Dallas dentist David Alameel, who ran unsuccessfully for Congress last year, filed paperwork to challenge Cornyn.