LANSING— The National Republican Congressional Committee sent a cautionary and somewhat scathing letter Friday to the cash-strapped Michigan Republican Party, warning the state GOP about its handling of $263,000 flowing to it through a fundraising operation. The letter, obtained by The Detroit News, showed that Republican leaders outside of Michigan have become concerned about the financial status of the state’s Republican Party, which is facing a leadership fight and had about $35,000 in its bank accounts in August. The new $263,000 would be a windfall for the Michigan GOP, representing seven…