Democratic vice presidential candidate Joe Biden says Republicans are employing "scurrilous" campaign tactics and is urging supporters not to be distracted from the economic issues affecting their lives.
Biden pointed to automated phone calls sent to voters in key swing states by Republican presidential candidate John McCain's campaign. The calls attempt to link Democratic presidential candidate Barack Obama to former '60s radical William Ayers.
The calls assert Obama has "worked closely domestic terrorist" Ayers, though there is no evidence the Illinois senator and Ayers are close.
Biden told a crowd of 3,800 at an evening rally in Henderson that Republicans are stepping up attacks that question Obama's patriotism.
The McCain campaign has defended the calls, saying the association between Ayers and Obama raises question about the Democrats' judgment.
