This company trades at a dirt-cheap valuation and is making strides after a difficult stretch.The stock market is on a great run, with the S&P 500 trading around all-time highs and up 53% since the bull market began in October 2022.However, it hasn't been smooth sailing for all stocks. Lincoln National Corporation (LNC -1.97%) is one beaten-down dividend stock selling at a bargain-bin price. Although the stock is up 48% in the last year, it remains 55% below its all-time high price as the company progresses ...