President Trump is building a fiercely loyal midterm army amid a revenge tour where MAGA credentials appear to outshine traditional conservatism. Why it matters: The president's victory lap following primary wins that ousted several objectors to his agenda could be premature, as there's no guarantee his endorsed candidate will win in November. However, if candidates do succeed in the midterms, the next group of MAGA politicians will be shaped even further in Trump's image. Dissenters in Congress will be few and far between. Context: Trump has maintained considerable control over MAGA during the primaries, even as his general approval plummets. Trump-backed Texas Senate candidate Ken Paxton trounced longtime Sen. John Cornyn (R) Tuesday, Rep. Thomas Massie (R-Ky.) lost to the president's endorsed candidate Ed Gallrein in a historically expensive race. Sen. Bill Cassidy (R-La.) also lost his primary earlier this month.…