SAN ANTONIO (CN) — On the last day to register to vote in Texas for next month’s elections, not far from where former Democratic presidential candidate Julian Castro announced his 2020 bid on San Antonio’s south side, an old bank-turned-law firm became the latest indicator that the country’s largest red state may be on the verge of becoming competitive for Democrats for the first time in the modern era.Billed as a “2020 drive-thru” where supporters could scoop up yard signs and other campaign swag being offered by the Bexar County Democratic Party, the rare in-person campaign event in a...…SAN ANTONIO (CN) — On the last day to register to vote in Texas for next month’s elections, not far from where former Democratic presidential candidate Julian Castro announced his 2020 bid on San Antonio’s south side, an old bank-turned-law firm became the latest indicator that the country’s largest red state may be on the verge of becoming competitive for Democrats for the first time in the modern era.Billed as a “2020 drive-thru” where supporters could scoop up yard signs and other campaign swag being offered by the Bexar County Democratic Party, the rare in-person campaign event in a...WW…