U.S. midterms could be the country's most expensive elections yet. To what end?

<img src='https://i.cbc.ca/ais/f870c1d0-ed89-4ab3-a211-516525d7b3e3,1793216955722/full/max/0/default.jpg?im=Crop%2Crect%3D%280%2C265%2C5079%2C2856%29%3B' alt='Democrat James Talarico addresses supporters at a rally for his U.S. Senate campaign in Lubbock, Texas on Wednesday, Oct. 27, 2026.' width='620' height='349' title='Democrat James Talarico addresses supporters at a rally for his U.S. Senate campaign in Lubbock, Texas on Wednesday, Oct. 27, 2026.'/><p></p>