As everyone knows, stocks do not go up in a straight line, not even during the holidays. So although the future looks bright for U.S. equities as the major indexes continue to hit or challenge new highs, the market has been gasping for a breather to gather bullish conviction. My fear has been that we might not see it until January, which likely would have resulted in a more severe correction at that time. But falling oil prices and a weak Energy sector seems to have introduced a reason to sell this week.

Although the stock market displayed weakness last week as I suggested it would, bulls aren’t going down easily. In fact, they’re going down swinging, absorbing most of the blows delivered by hesitant bears. Despite holding up admirably when weakness was both expected and warranted, and although I still see higher highs ahead, I am still not convinced that we have seen the ultimate lows for this pullback. A number of signs point to more weakness ahead.

Last week, I talked about the impressive strength this year in the Dow Jones Transportation Average, but it since has been hit by investors’ renewed worries about global economic growth and financial stability. Its fall has been led by weakness in the airlines.

For most of 2013 thus far, the market has been on a steady rise without volatility within a narrow channel. Bulls have been looking to recruit reinforcements for their assault on the all-time highs on the S&P 500 large caps and Dow Jones blue chips, after already taking out the all-time highs on the Russell 2000 small caps and S&P 400 mid caps.

An inordinately contentious and dispiriting election season left virtually everyone who was paying attention with a bitter taste in their mouth about the say-whatever-it-takes politicians that so desperately seek the honor of representing us. But never fear, at least we can still look to the top brass in our military for leaders with the utmost in discipline and integrity, right?

U.S. stocks are raring to rally. Earnings reports have been quite good. Consumers are spending despite stubbornly high unemployment. Interest rates are at rock bottom, which is good for borrowing and also makes stock yields relatively attractive. So what’s the problem? Oh, just the usual—fear of a European debt meltdown triggering a global recession.