geoff: kathleen clark is a professor of law in st. louis.nks so much for joining us. >> thank you. amna: a congressional primary election in texas is getting national attention for what it could mean for the future of the republican party and for other incumbents facing far right challengers. nor brown lopez has more. laura: more extreme far right candidates are running up and down the ballot this year. in texas, congressman tony gonzales, who has worked across the aisle on a number of issues, faced such a challenge. last night, gonzales narrowly staved off the far-right youtube personality, brandon herrera, receiving 50.7% of the vote to herrera's 49.3%. to discuss what these growing divides mean for the future of the republican party, i'm joined former republican congressman, joe walsh. congressman, thanks so much for being here. he forced congressman gonzales into this runoff and was attacking gonzales specifically for voting for bipartisan bills on gun safety, and gonzales barely won by 407 votes. what is your big take away from this? jo