By BILL BARROW, ZEKE MILLER and NICHOLAS RICCARDI WASHINGTON (AP) — Vice presidential hopefuls Tim Walz and JD Vance focused their criticism on the top of the ticket on Tuesday as they engaged in a policy-heavy discussion that may be the last debate of the 2024 presidential campaign. It was the first encounter between Minnesota’s Democratic governor and Ohio’s Republican senator, following last month’s debate between Vice President Kamala Harris and former President Donald Trump.