Katie Britt’s getting a boost from her former boss, the top Republican on the Appropriations Committee, in her bid to replace him in the Senate. Sen. Richard Shelby plans to use his own campaign funds and sway with colleagues to help Britt overcome Donald Trump-backed primary opposition. Amid a whirlwind of fundraisers and meetings for Britt this month in Washington, many of Shelby’s colleagues described her as extremely well-qualified to succeed him after he retires next year and possibly even win a slot on the powerful committee that oversees $1.3 trillion in annual spending. Shelby’s made no secret of his...