This ETF is a promising buy if you're looking for growing dividend income.Don't underestimate the power of dividend-paying stocks. Dividend payers are a select group, because in order to commit to paying a regular dividend, a company's management must be fairly confident in the reliability of its cash flows, finding them sufficient to support the dividend. No company wants to have to shrink or eliminate its dividend, as that would be a red flag to investors.Consider this from the folks at the Hartford Funds ...